package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
        /*
        StringBuilder builder1=new StringBuilder();
        StringBuilder builder2=new StringBuilder("abc");
        String str="abc";
        StringBuilder builder3=new StringBuilder(str);
        String str2=builder3.toString();


        String str="好好学习java";
        StringBuilder builder=new StringBuilder(str);

        builder.append(",为了找个好工作");
        System.out.println(builder);

        builder.replace(9,16,"就是为了改变世界");
        System.out.println(builder);

        builder.delete(0,8);
        System.out.println(builder);

        builder.insert(0,"活着");
        System.out.println(builder);

         */

        StringBuilder builder1=new StringBuilder();
        StringBuilder builder2=new StringBuilder("abc");
        String str="abc";
        StringBuilder builder3=new StringBuilder(str);
        String str2=builder3.toString();


        String str3="好好学习java";
        StringBuilder builder=new StringBuilder(str3);

        builder.append(",为了找个好工作");
        System.out.println(builder);

        builder.replace(9,16,"就是为了改变世界");
        System.out.println(builder);

        builder.delete(0,8);
        System.out.println(builder);

        builder.insert(0,"活着");
        System.out.println(builder);

    }
}
